Gauge testing apparatus



sept. 21, 1943.

vc. w. cLARK GAUGE TESTING APPARATUS Filed March 13, 1943 `3 Sheets-Sheet 1 Ilullll."

Sept. 21, 1943. jc. w. cLARK GAUGE TEsTNG APPARATUs Filed March 13, 1943 5 Sheets-Shet 2 mmm IN VENTOR. W w. GM

sept. 21, 1943. c. w. CLARK 2,329,828

GAUGE TESTING APPARATUS Filed March 13, 1943 5 Sheets-Sheet 3 INVENTOR.

BY W

'-.Geode'rEs'rING ArPARA'rUs Fig;' 3'isjan` end view with'fpar`ts omitted for purposes ofclal'fity. v c ,v o Figf is a sectionfon line ,Li-Hi of Fi'g". 1`.` The drawings vshow legs 'Hi -mountingefa base IZ formed'wi'th gtrjooves or ways l'i rcei'viln and slid'ably mounting'fiangesi 15 of; aicarn blockll navingja cam surface';l'l, 'the ;block having a tapped hole'for receivingf the fe'nd Qfjanl operating' screw 18, Vjou'rnalle'd in' av b'earing 20, fixedfto the base, and having near 'its end a diaI wheel 22 and at its end 2, hand Wheel, Zyboth Wheels being fixedj` to the sC'reW, so th'at'rotationof wheel 24 'causes theA screwiflBjandwheel' 22 to rota't'e and A lix),k slide; it formin'g. a, nut for' the cam I block the screwg Afbracl'et ZSffixed to bearingifihasa 'fioition' 21 di's'lle'd parallel vto theewheel. 22; ,If1ear diah; and formedlfwth af cutoutl 28`traversed'b hair imesolenabhng reading feiaizs. 1 "Base lzfmounts 'a upp'ortmgj bfracket '82 for' a refiecting inirron 3/1 inf .which fia bei/iewed, from 'the front of the base' |2,V the refl'ection of dial 2'5 and cntout 218 an'dhairlirie iii).V

Base j|2 valso. rn'c'nintsa spborting' acket 36 for an indicator A3l'w1`o'se.dial ;i ii; 7ide'r'lti'calv-t'o dial 25,-'15 traversea by a hair 11ne. came,aiaibeing operatively 'connected toV lan actuate element. or point 44 engaged bvand'raised' dr lowered by "cam V surface' H of cai 'bIockc IS as the screw 18 is rotated by the hand wheel 24, manipulatedby an operator who can view dials and 40 simultaneously, using mirror 34, and compare their positions with respect' to the fixed hair lines 30, 42,

as the dials rotate under the same force, the movement of screw IB.

In a device that hasv been made according to the invention hereof, the screw 18 was formed with ten threads per inch, the cam surface IJ was formed with a run to rise ratio of 10, and the indicator 38 was formed. to require 3670 turn of the screw for a 360 travel of dial 40.

While the indicator shown happens .to be' of. the type wherein the dial rotate, relative to'ia hair line,^a different type' of .indicatozf could'| very. well be'tested, such as'onewith. a stationary dial and a movable pointer. Similarly`,'whereas hand wheel 22 is shown as mounting a dial which `vrotates relative to hair line 30, it .could veryw'ell be the case that,V the hand wheel: might mountaa pointer which could move relative;l to a: fdial mounted on the stationaryi b'racket 26; [5AA clial moving relative to' a' statonary hair :line forms the full qui'valent of4 ainointer .movingrelative' to a stationary dial.. .1.1 i ;L1 V However, .for the purposes of thisfcasel 'have shown both dials; and; hair line constructions as. identical and have chosen to illustratean.: indicatjor of the type wherein a..dial moves relatiive to a stationary hair line; 1 .I 1 ;i o It will be observed that; the comparator her'ein shown isso construicted that'an1'operatonsitting i in front'of. it may' view vthe in'dicator 38and' the standard dialig 25.v si-mu1ta`neously, manipulating the scr'ew. IB with her'l'right'ihandi onewheeli 24'. Comparisonjs at many points of the dial may be' made; thebperator 'merellturn'ingthe'v Wheel 24 and stoppin'g m'omentari-'ly' as each' ofthegraduf; ati'onsuon dial 25,'reaches hair; 1`ine.30 whereupoif she may .view dial Ilu to' seeif itsgraduations have re'ached hairl'hne 42. `1 'US1' .".l

'It will be obs'ervedv thatfiin .thetevent that-'there is' a 'difference between' the -r'eading's"amdi'ala and' that .at dial .25; andvifr' it Iis'.'.dicovered that. that difference is duetozan"erronLinthe :screw 18,1 it not accurate'ly. .correszzvonding .toucarrig` H, compensation ca'nfbef madeby 'altrin'g the: ang'le' ofcam 11, rather than by rethre'a'ding'. screw'l; the .former' operationbeing'smpier 'thjarn the latte'ri i As. a matter; of fact, the; pitch': of screw-i| 8 be any.givennumberghthefbnly requirement being' thattthe an'gle of cam `t'lbe relatedltit'cin' a predetermined plfop'ortion, 'so that'fthe'readifigs on' diaIs- Z and 40""be'identi'ca .Jor'Y l'ate'd.. p'redetermined briiortion; w, Now having described the comparato'r, reference should be Ahad to the claims which follow.

I claim:

1. A comparator for inclicators having dials and hair'lines and actuated elements, `comprising a base, a cam slidably but not rotatably mounted therein, means for supporting an indicator on the base in such a position that its actuated lele- 'ment is engaged by the cam in its sliding movethreaded into the cam, with the latter forming a nut therefor, a bearing on said base for said screw, a hand wheel on said screw for rotating it and thus causing the cam to slide, a dial fixed to said screw to rotate therewith and formed identical With the dials of the indicators to be mounted on the base, a hair line fixedly mounted on the base, and a mirror mounted on the base to enable an operator to view the relation of the screw mounted dial and its hair line and the relation of the base mounted dial and its hair line, simultaneously for comparison.

2. A comparator for indicators having dials and hair lines and actuated elements, comprising a base, a cam slidably but not rotatably mounted therein, means for supporting an indicator on the base in such a position that its actuated element is engaged by the cam in its sliding movement Whereby cam travel is translated, in definite predetermine proportion, into dial indication by dial movement relative to ;the hair line, a screw threaded into the cam, with the latter forming a nut therefor, a bearing on said base for said screw, a hand Wheel on said screw for rotating it and thus causing the cam to slide, a dial fixed to said screw to rotate therewith and formed identical with the dials of the indicators to be mounted on the base, a hair line fixedly mounted on the base, and a mirror mounted on the base to enable an operator to view the relation of the screw mounted dial and its hair line and the relation of the base mounted dial and its hair line, simultaneously for comparison, the aXl's of the screw being normal to thedirection of movement of the actuated element of the indicator mounted on the base.

3. A comparator for indicators having movable elements and stationary elements, whose interrelationA is. the indicating relation, and actuated elements operatively connected to the movable elements, comprising a base, ,a cam slidably but not rotatably mountedtherein, means for supporting `an indicator` on the` base in such a 'position that its actuated element is engaged by the cam in its sliding movement whereby cam travel is translated, in definite' predetermined proportion, into dial indication by a change in the indicating relation, a screw threaded into the cam, with the latter forming a nut therefor, a bearing on said base for said screw, a hand wheel on said screw for rotating it and thus causing thercam to slide, an indicator having a movable element fixed to saidscrew to rotate therewith and a stationary element fixedly mounted on the base, the interrelation of these elements being a second indicating relation. r

4. A comparator for indicators having movable elements and stationary elements, whose interrelation is the` indicating relation, and actuated elements operatively connected to the movable elements comprising `a base, a cam slidably but not rotatably mounted therein, means for supporting an indicator on the base in such a position that its actuated element is engaged by the cam in its sliding movement Whereby cam travel is translated, in definite predetermined proportion, into dial indication by a change in the indicating relation, a screw threaded into the cam, with the latter forming a nut therefor, a bearing on said base for said screw, a hand wheel on said screw for rotating it and thus causing the cam to slide, an indicator having a movable element fixed to said screw to rotate therewith and a stationary element fixedly mounted on the base, the interrelation of these elements being a second indicating relation, the axis of the screw being normal to the direction of movement of the actuated element of the indicator mounted on the base.

5. A comparator for indicators having movable elements and stationary elements, whose interrelation is the indicating relation, and actuated elements operatively connected to the movable elements, comprising a base, a cam slidably but not rotatably mounted therein, means for supporting an indicator on the base in such a position that its actuated element is engaged by the cam in its sliding movement whereby cam travel is translated, in definite predetermned proportion, into dial indication by a change in the indicating relation, a screw threaded into the cam, with the latter forming a nut itherefor, a, bearing on said base for said screw, a hand wheel on` said screw for rotating it and thus causing the cam to slide, an indicator having a movable .element fixed to said screw to rotate therewith and a stationary element fixedly mounted on the base, the interrelation of these elements being a second indicating relation, and a mirror mounted on the base to enable an operator to view the two indicating relations simultaneously for comparison.

6; A comparator for indicators having movable elements and stationary elements, whose interrelation is the indicating relation, and actuated.

elements operatively connected to the movable elements, comprising a base, a cam slidably but not rotatably mounted therein, means for supporting an indicator on. the base in such a position that its actuated element is engaged by the cam in its sliding movement whereby cam travel is translated, in definite predetermined proportion, into dialiindication by a change in the indicating relation, a screw threaded into the cam, with the latter forming a nut therefor, a bearing on 'said base for said screw, a hand Wheel on siad screwfor' rotating it and thus causing the cam to slide, an indicator having a movable element fixed to said screw torotate therewith and -a stationary elementfixedly mounted on'the base, the interrelation of these elements being a second indicating relation, and a mirror mounted on the base to enable ,an operator to view the two indi-` cating relations simultaneously for comparison,

the axis of the lscrew being normal to the directlonof movement of the actuated elementof the indicator mounted on the base. i

` J CLYDE W. CLARK. 

